# Relationship history for MSHA mine 3609110

Current hierarchy: **Wally T  Fetterolf → W. T. Fetterolf Coal Co. → New Philadelphia Stripping**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Wally T  Fetterolf → New Philadelphia Stripping; 2001-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W. T. Fetterolf Coal Co. → New Philadelphia Stripping; 2002-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wally T  Fetterolf → W. T. Fetterolf Coal Co.; 2002-07-22 to current/open; source msha-controller-operator-history